[PATCH 2/3] Input: of_touchscreen - fix setting max values on X/Y axis

[Dmitry Torokhov]

The binding specification says that "touchscreen-size-x" and "-y" specify
horizontal and vertical resolution of the touchscreen and therefore maximum
absolute coordinates should be reduced by 1 since we are starting with 0.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
 drivers/input/touchscreen/of_touchscreen.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/input/touchscreen/of_touchscreen.c b/drivers/input/touchscreen/of_touchscreen.c
index 759cf4b..50bc0f2 100644
--- a/drivers/input/touchscreen/of_touchscreen.c
+++ b/drivers/input/touchscreen/of_touchscreen.c
@@ -71,23 +71,25 @@ void touchscreen_parse_of_params(struct input_dev *dev, bool multitouch)
 
 	axis = multitouch ? ABS_MT_POSITION_X : ABS_X;
 	data_present = touchscreen_get_prop_u32(np, "touchscreen-size-x",
-						input_abs_get_max(dev, axis),
+						input_abs_get_max(dev,
+								  axis) + 1,
 						&maximum) |
 		       touchscreen_get_prop_u32(np, "touchscreen-fuzz-x",
 						input_abs_get_fuzz(dev, axis),
 						&fuzz);
 	if (data_present)
-		touchscreen_set_params(dev, axis, maximum, fuzz);
+		touchscreen_set_params(dev, axis, maximum - 1, fuzz);
 
 	axis = multitouch ? ABS_MT_POSITION_Y : ABS_Y;
 	data_present = touchscreen_get_prop_u32(np, "touchscreen-size-y",
-						input_abs_get_max(dev, axis),
+						input_abs_get_max(dev,
+								  axis) + 1,
 						&maximum) |
 		       touchscreen_get_prop_u32(np, "touchscreen-fuzz-y",
 						input_abs_get_fuzz(dev, axis),
 						&fuzz);
 	if (data_present)
-		touchscreen_set_params(dev, axis, maximum, fuzz);
+		touchscreen_set_params(dev, axis, maximum - 1, fuzz);
 
 	axis = multitouch ? ABS_MT_PRESSURE : ABS_PRESSURE;
 	data_present = touchscreen_get_prop_u32(np, "touchscreen-max-pressure",
-- 
2.4.3.573.g4eafbef

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